#include<iostream>
#include<queue>
using namespace std;

int main(){

    // priority_queue<int, vector<int>, greater<int>> pq;
    priority_queue<int, vector<int>> pq;
    for(int i = 0; i < INT_MAX; i++){
        pq.push(i);
    }

    for(cout<<"print pq: "; !pq.empty(); pq.pop()){
        cout<<pq.top()<<endl;;
    }

    return 0;
}